My daughter is 24 weeks old and has always been a great sleeper since about 6 weeks or so..she has been going to sleep around the same time and sleeping for 9-12 hours at night in her crib..the last 2 nights she wakes up the moment we put her in crib and she's screams like crazy..I just let her cry for 20 min hoping she would just go to sleep since she hasn't really slept or even napped (she's exhausted-rubbing her eyes and knocking out on me during feedings ) I seriously don't know what to do..last night she fell asleep at 4 am and was up a few hours later..anyone ever experience this ? If so how can I fix this? Her bedtime routine has no changed at all